v0.6.0

• Rename CMake project name from tsl_sparse_map to tsl-sparse-map for coherence with the convention used by most package managers. The find_package(tsl-sparse-map) command must now be used instead of the find_package(tsl_sparse_map).
• Set bucket count for default constructed map/set to 0 to avoid any allocation.
• Add support for efficient serialization (#6).
• On Windows, add tsl-sparse-map.natvis to the installed files.
• Fix CMake >= 3.13 warning on Policy CMP0076 and add quotes to paths.
• Remove cxx_std_11 from target_compile_features to avoid a warning with older versions of CMake that don't support it. The warning was given even if the target_compile_features was surrounded in a if(${CMAKE_VERSION} VERSION_GREATER "3.7").